排水预压法加固某高速公路软基效果的工程实例分析

Project Example Analysis of Effect of Consolidating Soft Roadbed of Expressway by Drainage Preloading Technology

以某高速公路应用塑料排水板堆载预压法处理深层软基为例,通过监测对加固效果进行分析。结果表明:加固后,土体的十字板剪切强度提高了40%,含水率大为减少;堆载结束后80 d内土体固结度达到90%以上,且土体的沉降趋于稳定,加固深度在15 m以上,加固效果明显。应用塑料排水板堆载预压法处理深厚层软土,可以加快软土的沉降速率,缩短工期,降低成本,是一种既经济又合理的地基处理方法。

Based on the example of processing deep soft roadbed by means of plastic drain board preloading technique applied for an expressway, this paper analyzes the effect of consolidation via monitor. The result shows that the cross board sheafing force of soil increases by 40 % and the water content decreases greatly after consolidation. The degree of consolidation of soil within 80d after preloading reaches more than 90%, and the sedimentation of soil tends to stability, the depth of consolidation is more than 15m and the effect is obvious. By fastening the sedimentation rate of the soft soil, shortening the duration of construction and reducing the cost, the plastic drain board preloading technique for processing deep and thick soft soil is demonstrated an economical and reasonable roadbed processing technique.